Nitrogen Assimilation
Nitrate is reduced to nitrite in plants by which enzyme?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More plant physiology Practice Questions
Considering the complete aerobic oxidation of one molecule of glucose, the net number of ATP molecul...
Considering the complete aerobic oxidation of one molecule of glucose, the net number of ATP molecul...
In the terminal oxidation step of aerobic respiration within mitochondria, which molecule serves as ...
In the terminal oxidation step of aerobic respiration within mitochondria, which molecule serves as ...
A germinating seed rich in carbohydrates is respiring aerobically, so the respiratory quotient measu...
A germinating seed rich in carbohydrates is respiring aerobically, so the respiratory quotient measu...
Glycolysis, the first stage in the breakdown of glucose during cellular respiration, takes place in ...
Glycolysis, the first stage in the breakdown of glucose during cellular respiration, takes place in ...
The dramatic elongation of internodes in genetically dwarf pea plants can be artificially induced by...
The dramatic elongation of internodes in genetically dwarf pea plants can be artificially induced by...
Short-day plants are induced to flower only when the duration of continuous darkness exceeds a criti...
Short-day plants are induced to flower only when the duration of continuous darkness exceeds a criti...
If a maize plant grows in height from twenty centimetres to fifty centimetres over a span of three d...
If a maize plant grows in height from twenty centimetres to fifty centimetres over a span of three d...
The phenomenon in which the growing apical bud suppresses the growth of the lateral buds below it is...
The phenomenon in which the growing apical bud suppresses the growth of the lateral buds below it is...
To synthesise one molecule of glucose, how many turns of the Calvin cycle are required, given that e...
To synthesise one molecule of glucose, how many turns of the Calvin cycle are required, given that e...
In the pressure-flow hypothesis of phloem translocation, food moves from a sugar source to a sugar s...
In the pressure-flow hypothesis of phloem translocation, food moves from a sugar source to a sugar s...
When a plant cell is placed in pure water and its protoplast presses firmly against the cell wall, w...
When a plant cell is placed in pure water and its protoplast presses firmly against the cell wall, w...
The enzyme RuBisCO can bind both carbon dioxide and oxygen at the same active site, and this dual af...
The enzyme RuBisCO can bind both carbon dioxide and oxygen at the same active site, and this dual af...
About This Question
- Subject
- biology
- Chapter
- plant physiology
- Topic
- nitrogen assimilation
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Nitrate reductase
- Nitrogen Uptake: Plants usually absorb nitrogen from the soil in the form of nitrate (NO3−).
- Two-Step Reduction: Before it can be used for amino acid synthesis, nitrate must be reduced to ammonium.
- Step 1: NO3− is reduced to Nitrite (NO2−) in the cytoplasm. This is catalyzed by the enzyme Nitrate Reductase.
- Step 2: Nitrite is then transported into chloroplasts/plastids and reduced to Ammonium (NH4+) by Nitrite Reductase.
- Others: Nitrogenase is for fixation of atmospheric N2 (in bacteria); Glutamine synthase incorporates NH4+ into amino acids.
This medium difficulty biology question is from the chapter plant physiology, covering the topic of nitrogen assimilation. It appeared in the 2025 exam.
Looking for more practice? Explore all biology questions or browse plant physiology questions on RankGuru.